Base board



FIG. 1 is a right front elevation view of said base board;

FIG. 2 is a right back elevation view of said base board;

FIG. 3 is a top plan view of said base board;

FIG. 4 is a left back elevation view of said base board;

FIG. 5 is a left front elevation view of said base board; and,

FIG. 6 is a bottom plan view of said base board. 

The ornamental design for a base board, as shown and described. 